Published α = 0.45 for bored piles, but local practice α = 0.65 (due to slow auger + bentonite). GEOSS design: Use α = 0.55 (interim) until confirmed by test.

GEOSS guidelines elevate the standard of documentation required for pile foundations.

: Modern practices strongly recommend borehole stability checks using bentonite or polymer slurry and verifying pile integrity before proceeding with pile cap construction. Common ST Plan Submission Mistakes | PDF - Scribd

Deep foundations, specifically pile foundations, are critical for supporting heavy structures when the upper soil layers lack sufficient bearing capacity. The serve as a comprehensive framework for engineers to ensure structural safety, economic efficiency, and environmental sustainability in diverse geological settings.

| Soil type | Local method | GEOSS requirement | |-----------|--------------|--------------------| | Soft clay | Hand auger + SPT | CPTu + vane shear | | Sand + gravel | Trial pits + DCPT | SPT N-values every 1 m | | Weathered rock | Local driller’s log | Core recovery + RQD | | Filled ground | Historical fill map | Dynamic probing + plate load test |